Study finds breast-fed babies are more temperamental

Breast-fed babies at age 3 months showed greater distress and had a tendency to smile and laugh less than formula-fed babies, according to a study in the journal Public Library of Science ONE. Researchers assessed the temperament of 316 babies and found that those who were breast-fed or mixed-fed were more difficult to manage and soothe compared with bottle-fed babies, but they encouraged breast-feeding mothers to persevere.